In recent years, approaches have been used to treat diaphyseal fractures in children and adolescents, which make it possible to shorten immobilization and hospitalization time as soon as possible, as well as return to normal life as soon as possible. In a retrospective study, the conservative treatment of diaphyseal hip fractures was compared with the closed elastic method of rod fixation. In the period from 2014 to 2019. In our clinic, 11 diaphyseal fractures of the femur and 16 tibia were treated. In all cases, elastic rod osteosynthesis was used. Conservative treatment gave more complications (difference in limb length and inaccurate reduction). In case of the closed fracture fixation with the help of flexible rods the consolidation and fast mobilization with small number of complications was achieved.